This particular lesson introduces you to the study of “Eschatology” (or, “last things”). Included in such a study is a description of (1) Hades, (2) Judgment, (3) Heaven and (4) Hell.
The idea here is help all to see what truly happens to us after death. Subsequent lessons will explore many of those who have claimed to have gone to heaven, and then returned to describe their experiences to us. Their problems will become apparent as we proceed, but let me briefly mention two: (1) They all belong to different religious denominations and (2) they have radically different descriptions of what they saw there.
If subjective experience is the criteria of truth, then perhaps they might be somewhat convincing. On the other hand, if objective evidence is the criteria and condition of truth, then they fall far short of being able to convince any genuine truth seeker.